<?php
/*********************************************************************************
 * SugarCRM Community Edition is a customer relationship management program developed by
 * SugarCRM, Inc. Copyright (C) 2004-2012 SugarCRM Inc.
 * 
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Affero General Public License version 3 as published by the
 * Free Software Foundation with the addition of the following permission added
 * to Section 15 as permitted in Section 7(a): FOR ANY PART OF THE COVERED WORK
 * IN WHICH THE COPYRIGHT IS OWNED BY SUGARCRM, SUGARCRM DISCLAIMS THE WARRANTY
 * OF NON INFRINGEMENT OF THIRD PARTY RIGHTS.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU Affero General Public License along with
 * this program; if not, see http://www.gnu.org/licenses or write to the Free
 * Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301 USA.
 * 
 * You can contact SugarCRM, Inc. headquarters at 10050 North Wolfe Road,
 * SW2-130, Cupertino, CA 95014, USA. or at email address contact@sugarcrm.com.
 * 
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License version 3.
 * 
 * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
 * these Appropriate Legal Notices must retain the display of the "Powered by
 * SugarCRM" logo. If the display of the logo is not reasonably feasible for
 * technical reasons, the Appropriate Legal Notices must display the words
 * "Powered by SugarCRM".
 ********************************************************************************/


/**
 * Class for parsing title from RSS feed, and keep default encoding (UTF-8)
 * Created: Sep 12, 2011
 */
class DashletRssFeedTitle {
	public $defaultEncoding = "UTF-8";
	public $readBytes = 8192;
	public $url;
	public $cut = 70;
	public $contents = "";
	public $title = "";
	public $endWith = "...";
	public $xmlEncoding = false;
	public $fileOpen = false;

	public function __construct($url) {
		$this->url = $url;
	}

	public function generateTitle() {
		if ($this->readFeed()) {
			$this->getTitle();
			if (!empty($this->title)) {
				$this->convertEncoding();
				$this->cutLength();
			}
		}
		return $this->title;
	}

	/**
	 * @todo use curl with waiting timeout instead of fopen
	 */
	public function readFeed() {
		if ($this->url) {
			$fileOpen = @fopen($this->url, 'r');
			if ($fileOpen) {
				$this->fileOpen = true;
				$this->contents = fread($fileOpen, $this->readBytes);
				fclose($fileOpen);
				return true;
			}
		}
		return false;
	}

	/**
	 *
	 */
	public function getTitle() {
		$matches = array ();
		preg_match("/<title>.*?<\/title>/i", $this->contents, $matches);
		if (isset($matches[0])) {
			$this->title = str_replace(array('<![CDATA[', '<title>', '</title>', ']]>'), '', $matches[0]);
		}
	}

	public function cutLength() {
		if (mb_strlen(trim($this->title), $this->defaultEncoding) > $this->cut) {
			$this->title = mb_substr($this->title, 0, $this->cut, $this->defaultEncoding) . $this->endWith;
		}
	}

	private function _identifyXmlEncoding() {
		$matches = array ();
		preg_match('/encoding\=*\".*?\"/', $this->contents, $matches);
		if (isset($matches[0])) {
			$this->xmlEncoding = trim(str_replace('encoding="', '"', $matches[0]), '"');
		}
	}

	public function convertEncoding() {
		$this->_identifyXmlEncoding();
		if ($this->xmlEncoding && $this->xmlEncoding != $this->defaultEncoding) {
			$this->title = iconv($this->xmlEncoding, $this->defaultEncoding, $this->title);
		}
	}
}